I'd like , please <a href=" http://www.memories-book.co.uk/blog/gun-control-argumentative-essay/ ">museum thesis</a> The volunteers were randomly allocated to two groups. One group was asked to sleep for six-and-a-half hours a night, the other got seven-and-a-half hours. After a week the researchers took blood tests and the volunteers were asked to switch sleep patterns. The group that had been sleeping six-and-a-half hours got an extra hour, the other group slept an hour less.